An extended improved coring inner tube

Abstract

This utility model relates to the field of exploration technology and discloses an extended and improved coring inner tube, including an upper inner tube, a middle inner tube, and a lower inner tube. The middle inner tube is located at the bottom of the upper inner tube and is engaged with the shaft end of the upper inner tube. The lower inner tube is located at the bottom of the middle inner tube and is engaged with the shaft end of the middle inner tube. All three inner tubes are hollow cylindrical structures of equal length and open at both ends. The model also includes auxiliary components, which are disposed inside the shaft end engagements between the upper and middle inner tubes and between the middle and lower inner tubes. The auxiliary components include clamping parts and rubber sealing rings, and the three clamping parts are arranged in a ring array. This extended and improved coring inner tube, through its segmented design and precision connection structure, maintains a total length of 4.5 meters to achieve the "three drilling and one coring" mode while solving the problem of transporting and maintaining long inner tubes, thus significantly improving exploration efficiency.

Description

Technical Field

[0001] This utility model relates to the field of exploration technology, specifically to an extended and improved coring inner tube. Background Technology

[0002] In geological exploration, the core tube is a key component for obtaining underground rock cores. Its structure and length directly affect exploration efficiency and core quality. Traditionally, the core tube is matched with the drill pipe length and needs to be frequently raised and lowered with the drill pipe to extract the rock core. The structural design of the core tube needs to take into account both strength and core integrity to ensure that it is not damaged under drilling pressure and can preserve the rock core sample intact. Therefore, the setting of the core tube length and the connection method are important directions for optimizing exploration operations.

[0003] In existing technologies, conventional coring inner tubes are the same length as 1.5-meter drill pipes and adopt a "one drill, one retrieval" mode, which has obvious limitations: frequent tripping up and down of the drill leads to low operating efficiency and a high proportion of auxiliary processes; frequent disassembly and assembly of drill tools aggravates joint wear and shortens service life; and in complex strata, inadequate inner tube structure design can easily lead to fluctuations in core recovery rate and increase exploration costs. These problems are particularly prominent in deep hole or large-scale exploration projects. To address these issues, we propose an extended and improved coring inner tube. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an extended and improved core-taking inner tube, which solves the aforementioned problems.

[0005] To achieve the above-mentioned objectives, this utility model provides the following technical solution: an extended and improved core-taking inner tube, comprising:

[0006] The upper inner tube, the middle inner tube, and the lower inner tube are provided. The middle inner tube is provided at the bottom of the upper inner tube and is engaged with the shaft end of the upper inner tube. The lower inner tube is provided at the bottom of the middle inner tube and is engaged with the shaft end of the middle inner tube. The upper inner tube, the middle inner tube, and the lower inner tube are all hollow cylindrical structures with equal length and open at both ends.

[0007] An auxiliary component is disposed inside the axial end engagement between the upper inner tube and the middle inner tube, and between the middle inner tube and the lower inner tube. The auxiliary component includes a clamping element and a rubber sealing ring, and the three clamping elements are arranged in a ring array.

[0008] Preferably, the upper inner tube shaft end is provided with a connector, the connector shaft end is provided with a semi-circular sealing groove, and one side wall of the connector is provided with three locking strips arranged in a ring array. The locking strips are in an F-shaped structure. The side wall of the locking strips is provided with two locking blocks, and the side wall of the upper inner tube is provided with three pull slots arranged in a ring array. The pull slots are positioned on the opposite side of the locking blocks.

[0009] Preferably, the inner tube shaft end of the middle section has a connecting cavity 1, and the shaft end of the connecting cavity 1 has a semi-circular sealing groove 2, which corresponds to the semi-circular sealing groove 1 and forms a complete hollow ring. The connecting cavity 1 has three clamping grooves arranged in a ring array, and the clamping grooves are slidably connected with the clamping strip. The inner wall of the clamping groove has two locking openings, and the locking openings are corresponding to the locking blocks for locking.

[0010] Preferably, the inner tube in the middle section is provided with a second connector on the side of the shaft opposite to the connecting cavity, and the second connector has the same structure as the first connector.

[0011] Preferably, the lower inner tube shaft end is provided with a second connecting cavity, and the second connecting cavity has the same structure as the first connecting cavity, and the second connecting head is engaged with the second connecting cavity.

[0012] Preferably, the auxiliary component is positioned between connector one and connecting cavity one, and connector two and connecting cavity two, and the shaft end of the auxiliary component is a rubber sealing ring, which is positioned inside the complete hollow ring formed by semicircular sealing groove two and semicircular sealing groove one. The outer side of the auxiliary component has three clamping parts.

[0013] Preferably, the clamping member has an overall elongated structure and is slidably connected to the inside of the pull-out slot. The shaft end of the clamping member is inserted into the inside of the clamping groove. The two opposite sidewalls of the clamping member are respectively fitted and engaged with the sidewall of the clamping strip and the inner wall of the clamping groove. The sidewall of the shaft end of the clamping member is provided with a protrusion, which is placed inside the pull-out slot, and the sidewall of the protrusion has two removal holes.

[0014] Compared with the prior art, this utility model provides an extended and improved core-taking inner tube, which has the following beneficial effects:

[0015] This extended and improved core sampling inner tube, through its segmented design and precision connection structure, maintains a total length of 4.5 meters to achieve the "three drills, one core" mode while solving the problems of transporting and maintaining long inner tubes. The separate design of the upper, middle, and lower inner tubes facilitates handling in complex terrain. During connection, the sliding fit between the clamping strip and the clamping groove, the snap-fit ​​between the clamping block and the clamping mouth, combined with the fixing effect of the clamping components, ensure structural stability. The compression seal of the rubber sealing ring in the semi-circular sealing groove one and semi-circular sealing groove two ensures that the rock core is not contaminated. This design retains the advantages of the extended inner tube in reducing the number of drilling trips and improving efficiency, while also reducing the difficulty of operation through convenient disassembly and assembly. It is suitable for various exploration scenarios, and can significantly improve the convenience of construction, especially in areas where transportation conditions are limited. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the extended and improved core-taking inner tube structure of this utility model;

[0017] Figure 2This is a schematic diagram of the upper inner tube of this utility model;

[0018] Figure 3 This is a schematic diagram of the inner tube in the middle section of this utility model;

[0019] Figure 4 This is a schematic diagram of the clamping component of this utility model.

[0020] In the diagram: 1. Upper inner tube; 2. Middle inner tube; 3. Lower inner tube; 4. Clamping element; 5. Rubber sealing ring; 6. Connector 1; 7. Connecting cavity 1; 8. Connector 2; 9. Connecting cavity 2; 10. Semicircular sealing groove 1; 11. Clamping strip; 12. Pull-out slot; 13. Clamping block; 14. Clamping groove; 15. Bayonet; 16. Semicircular sealing groove 2; 17. Protrusion; 18. Removal hole. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-4 An extended and improved coring inner tube includes:

[0023] The system consists of an upper inner tube 1, a middle inner tube 2, and a lower inner tube 3. The middle inner tube 2 is located at the bottom of the upper inner tube 1 and is connected to the shaft end of the upper inner tube 1. The lower inner tube 3 is located at the bottom of the middle inner tube 2 and is connected to the shaft end of the middle inner tube 2. All three sections of the inner tube are hollow cylindrical structures with equal lengths and open ends. The complete inner tube is 4.5 meters long, which is scientifically matched with the 1.5-meter drill rod currently used in the construction, forming a three-fold matching relationship. The efficient "three-drill-one-extraction" operation mode significantly improves the performance advantages in all aspects.

[0024] The auxiliary components are located inside the shaft end clamping joint between the upper inner tube 1 and the middle inner tube 2, and between the middle inner tube 2 and the lower inner tube 3. The auxiliary components include clamping parts 4 and rubber sealing rings 5, and the three clamping parts 4 are arranged in a ring array.

[0025] Furthermore, the upper inner tube 1 has a connector 6 at its shaft end, a semi-circular sealing groove 10 at its shaft end, and three locking strips 11 arranged in a ring array on the side wall of the connector 6. The locking strips 11 are F-shaped in shape, and two locking blocks 13 are provided on the side wall of the locking strips 11. The upper inner tube 1 has three pull slots 12 arranged in a ring array on the side wall. The pull slots 12 are placed on the opposite side of the locking blocks 13. The connector 6 is inserted into the connecting cavity 7 and completes the connection assembly work with the auxiliary components.

[0026] Furthermore, a connecting cavity 7 is provided inside the shaft end of the middle section inner tube 2, and a semi-circular sealing groove 16 is provided inside the shaft end of the connecting cavity 7. The semi-circular sealing groove 16 corresponds to the semi-circular sealing groove 10, and the semi-circular sealing groove 16 and the semi-circular sealing groove 10 form a complete hollow ring. Three clamping grooves 14 are provided inside the connecting cavity 7 in a ring array, and the clamping grooves 14 are slidably connected with the clamping strip 11. Two latches 15 are provided on the inner wall of the clamping grooves 14, and the latches 15 are corresponding to the clamping blocks 13 for engagement. The rubber sealing ring 5 is placed inside the semi-circular sealing groove 16, and the connector 6 at the shaft end of the upper section inner tube 1 is inserted into the connecting cavity 7. Specifically, the clamping strip 11 is inserted along the shaft end of the upper section inner tube 1. The locking groove 14 slides in, and the size of the locking groove 14 is wider than that of the locking strip 11. When the shaft end of the connector 16 contacts the rubber sealing ring 5, the rubber sealing ring 5 is compressed inside the complete hollow ring formed by the semi-circular sealing groove 2 16 and the semi-circular sealing groove 10. Rotate the upper inner tube 1 so that the two locking blocks 13 on the side wall of the locking strip 11 engage with the two locking slots 15. Insert the locking piece 4 into the locking groove 14 from the inside of the pull slot 12 so that the locking block 13 and the locking slot 15 are stably and firmly engaged, preventing rotation and disengagement, thus completing the connection assembly. The connection method between the middle inner tube 2 and the lower inner tube 3 is the same as the above method. When disassembly is required, the locking piece 4 can be pulled out to complete the disassembly. The overall structure is simple and convenient.

[0027] Furthermore, the middle section inner tube 2 is provided with a connector 2 8 on the side of the shaft opposite to the connecting cavity 7, and the connector 2 8 has the same structure as the connector 6.

[0028] Furthermore, the lower inner tube 3 has a connecting cavity 2 9 at its shaft end, and the connecting cavity 2 9 has the same structure as the connecting cavity 1 7. The connecting head 2 8 is engaged with the connecting cavity 2 9.

[0029] Furthermore, the auxiliary components are respectively placed between connector 1 6 and connecting cavity 1 7, connector 2 8 and connecting cavity 2 9, and the shaft end of the auxiliary components is a rubber sealing ring 5. The rubber sealing ring 5 is respectively placed inside the complete hollow ring formed by semi-circular sealing groove 2 16 and semi-circular sealing groove 10. The outer side of the auxiliary components is three clamping parts 4. The compressed rubber sealing ring 5 effectively ensures the sealing of the connection.

[0030] Furthermore, the clamping component 4 has an overall elongated structure and is slidably connected to the inside of the pull-out slot 12. The shaft end of the clamping component 4 is inserted into the inside of the clamping groove 14. The two opposite sidewalls of the clamping component 4 are respectively fitted and engaged with the sidewall of the clamping strip 11 and the inner wall of the clamping groove 14. The sidewall of the shaft end of the clamping component 4 is provided with a protrusion 17, which is placed inside the pull-out slot 12. The sidewall of the protrusion 17 has two removal holes 18. The clamping component 4 effectively prevents the clamping position from rotating, improving the structural stability. The operator can pull out the clamping component 4 through the removal holes 18 of the protrusion 17 to release the clamping between the three inner tubes.

[0031] Structural Description:

[0032] Upper Inner Tube 1: Upper Inner Tube 1 is the top section of the core-taking inner tube. It is a 1.5-meter-long hollow cylinder with open ends. The shaft end is equipped with a connector 6, which is engaged with the shaft end of the middle inner tube 2. It is an important part of the 4.5-meter inner tube.

[0033] Middle section inner tube 2: Middle section inner tube 2 is the middle section of the core-taking inner tube. It is a hollow cylinder 1.5 meters long. The shaft end has a connecting cavity 1 7 and a connecting head 2 8, which are respectively snapped into the upper section inner tube and the lower section inner tube 3, serving as a connection and transition function.

[0034] Lower inner tube 3: The lower inner tube 3 is the bottom section of the core-taking inner tube. It is a 1.5-meter-long hollow cylinder with a connecting cavity 9 at the shaft end, which is engaged with the connecting head 8 of the middle inner tube 2 to form a complete inner tube.

[0035] Clamping component 4: Clamping component 4 is a long strip structure that slides with the pull slot 12. The shaft end is inserted into the clamping groove 14, and the two sides are in contact with the clamping strip 11 and the inner wall of the clamping groove 14 to prevent the clamping position from rotating and to enhance stability.

[0036] Rubber sealing ring 5: The rubber sealing ring 5 is placed in the ring formed by the semi-circular sealing groove 10 and the semi-circular sealing groove 16. When compressed, it achieves the sealing between the connector and the connecting cavity, thus preventing the rock core from being contaminated.

[0037] Connector 6: Connector 6 is located at the shaft end of the upper inner tube 1, and has a semi-circular sealing groove 10. The side wall has three annular array of F-type retaining strips 11, which are used to insert into the connecting cavity 7 to achieve connection.

[0038] Connecting cavity 1 7: Connecting cavity 1 7 is located inside the shaft end of the middle section inner tube 2. It has a semi-circular sealing groove 2 16 and three annular array of clamping grooves 14, which cooperate with connecting head 1 6 to engage and is the structure for connecting the upper section inner tube.

[0039] Connector 2 8: Connector 2 8 is located at the shaft end of the middle section inner tube 2 away from the connecting cavity 1 7. Its structure is the same as that of connector 1 6. It is used to insert into the connecting cavity 2 9 of the lower section inner tube 3 to achieve connection.

[0040] Connecting cavity 2 9: Connecting cavity 2 9 is located at the shaft end of the lower inner tube 3. Its structure is the same as that of connecting cavity 1 7. It has a semi-circular sealing groove and a clamping groove inside, which cooperate with connecting head 2 8 to connect the middle inner tube.

[0041] Semicircular sealing groove 10: Semicircular sealing groove 10 is opened at the shaft end of connector 6, corresponding to semicircular sealing groove 2 16 of connecting cavity 7, together forming a complete ring for placing rubber sealing ring 5.

[0042] Locking strip 11: Locking strip 11 is an F-shaped structure on the side wall of connector 1 6 and connector 2 8, distributed in a ring array, and can slide into the locking groove 14. The side wall has a locking block 13 for engaging with the locking slot 15.

[0043] Pull-out slot 12: The pull-out slot 12 is opened on the side wall of the upper inner tube 1 and the middle inner tube 2, and is distributed in a ring array. It corresponds to the opposite side of the locking block 13, allowing the locking member 4 to be inserted and pulled out, which is convenient for operation.

[0044] Locking block 13: Locking block 13 is provided on the side wall of locking strip 11, and there are two of them. They can be engaged with the locking slot 15 on the inner wall of locking groove 14 to achieve the initial fixation of connector and connecting cavity.

[0045] Clamping groove 14: Clamping groove 14 is opened inside connecting cavity 1 7 and connecting cavity 2 9, and is distributed in a ring array. It is wider than the clamping bar 11, so that the clamping bar 11 can slide in and provide it with movement space;

[0046] Bayonet 15: Two bayonet 15s are provided on the inner wall of the clamping groove 14. They are matched with the locking blocks 13 on the locking strip 11 to enhance the locking stability between the connector and the connecting cavity.

[0047] Semicircular sealing groove 2 16: Semicircular sealing groove 2 16 is opened inside the shaft end of connecting cavity 1 7 and connecting cavity 2 9, corresponding to the semicircular sealing groove 10 of the connector, together forming a space for placing the rubber sealing ring.

[0048] Protrusion 17: Protrusion 17 is provided on the side wall of the shaft end of the clamping member 4 and is placed inside the pull-out slot 12. It can enhance the fit between the clamping member 4 and the pull-out slot 12 and make it easier for the operator to hold and pull out the clamping member.

[0049] Removal Hole 18: Two removal holes 18 are provided on the side wall of the protrusion 17, allowing the operator to hold them with tools or fingers to easily remove the locking piece 4 from the slot 12.

[0050] Working principle: Install the extended and improved core-taking inner tube correctly according to the diagram. Based on the synergistic design of the segmented combined structure and the "three-drill-one-core-taking" operation mode: the upper inner tube 1, middle inner tube 2, and lower inner tube 3 are all 1.5-meter-long hollow cylinders. Through auxiliary components, the shaft ends are snapped together to form a complete core-taking inner tube, assembling a total length of 4.5 meters, forming a three-fold matching relationship with the 1.5-meter drill rod. During connection, the rubber sealing ring 5 is placed into the semi-circular sealing groove 16 of the middle inner tube 2, and the connector 6 of the upper inner tube 1 is inserted into the connecting cavity 7 of the middle inner tube 2, allowing the retaining strip 11 to slide in along the retaining groove 14. The shaft end squeezes the rubber sealing ring 5 until the semi-circular sealing groove 10 and the semi-circular sealing groove 16 are formed. Inside the ring, rotate the upper inner tube 1 to make the locking block 13 engage with the locking slot 15, and then insert the clamping member 4 from the pull slot 12 into the clamping groove 14. The relative position of the locking strip 11 and the clamping groove 14 is fixed by the protrusion 17 to prevent loosening. The middle inner tube 2 and the lower inner tube 3 are connected in the same way through the connector 2 8 and the connecting cavity 2 9. During operation, after drilling three times with the 1.5-meter drill rod (total 4.5 meters), the clamping member 4 is pulled out through the take-out hole 18 to release the locking block 13 from the locking slot 15. The three sections of inner tube are then separated to extract the rock core. The rubber sealing ring 5 ensures the connection is sealed to prevent mud from contaminating the rock core. The clamping member 4 and the locking structure ensure the stability during drilling. The whole process achieves efficient core extraction and convenient disassembly and assembly.

[0051] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An extended improved coring inner tube characterized by, include: The upper inner tube (1), the middle inner tube (2) and the lower inner tube (3) are provided. The bottom of the upper inner tube (1) is provided with the middle inner tube (2). The middle inner tube (2) is engaged with the shaft end of the upper inner tube (1). The bottom of the middle inner tube (2) is provided with the lower inner tube (3). The lower inner tube (3) is engaged with the shaft end of the middle inner tube (2). The upper inner tube (1), the middle inner tube (2) and the lower inner tube (3) are all hollow cylindrical structures with equal length and open at both ends. An auxiliary component is provided inside the shaft end of the upper inner tube (1) and the middle inner tube (2), and the middle inner tube (2) and the lower inner tube (3). The auxiliary component includes a clamping element (4) and a rubber sealing ring (5), and the three clamping elements (4) are arranged in a ring array.

2. A lengthened and modified coring inner tube according to claim 1, characterized in that, The upper inner tube (1) is provided with a connector (6) at the shaft end. A semi-circular sealing groove (10) is provided at the shaft end of the connector (6). The side wall of the connector (6) is provided with three locking strips (11) arranged in a ring array. The locking strips (11) are in an F-shaped structure. The side wall of the locking strips (11) is provided with two locking blocks (13). The side wall of the upper inner tube (1) is provided with three pull slots (12) arranged in a ring array. The pull slots (12) are placed on the opposite side of the locking blocks (13).

3. The extended improved coring inner tube of claim 1 wherein, The inner shaft end of the middle section inner tube (2) is provided with a connecting cavity 1 (7), and the shaft end of the connecting cavity 1 (7) is provided with a semi-circular sealing groove 2 (16). The semi-circular sealing groove 2 (16) corresponds to the semi-circular sealing groove 1 (10), and the semi-circular sealing groove 2 (16) and the semi-circular sealing groove 1 (10) form a complete hollow ring. The connecting cavity 1 (7) is provided with three clamping grooves (14) arranged in a ring array, and the clamping grooves (14) are slidably connected with the clamping strip (11). The inner wall of the clamping grooves (14) has two latches (15), and the latches (15) are corresponding to the clamping blocks (13) for engagement.

4. A lengthened and modified coring inner tube according to claim 3, characterized in that, The middle section inner tube (2) is provided with a connector two (8) on the side of the shaft opposite to the connecting cavity one (7). The connector two (8) has the same structure as the connector one (6).

5. The extended improved coring inner tube of claim 1 wherein, The lower inner tube (3) is provided with a connecting cavity two (9) at the shaft end, and the connecting cavity two (9) has the same structure as the connecting cavity one (7). The connecting head two (8) and the connecting cavity two (9) are engaged and snapped together.

6. The extended improved coring inner tube of claim 1 wherein, The auxiliary component is placed between connector one (6) and connecting cavity one (7), connector two (8) and connecting cavity two (9), and the shaft end of the auxiliary component is a rubber sealing ring (5). The rubber sealing ring (5) is placed inside the complete hollow ring formed by semi-circular sealing groove two (16) and semi-circular sealing groove one (10). The outer side of the auxiliary component has three clamping parts (4).

7. A lengthened and modified coring inner tube according to claim 6, wherein, The clamping member (4) is a long strip structure, and the clamping member (4) is slidably connected to the inside of the pull-out slot (12). The shaft end of the clamping member (4) is inserted into the inside of the clamping groove (14). The two opposite side walls of the clamping member (4) are respectively attached to the side wall of the clamping strip (11) and the inner wall of the clamping groove (14). The side wall of the shaft end of the clamping member (4) is provided with a protrusion (17). The protrusion (17) is placed inside the pull-out slot (12), and the side wall of the protrusion (17) has two removal holes (18).

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